package com.yebxxx.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * jwt登录授权过滤器
 */
public class JwtFilter extends OncePerRequestFilter {
    @Value("${jwt.tokenHeader}")
    private  String tokenHeader;
    @Value("${jwt.tokenHead}")
    private  String tokenHead;

    @Autowired
    private  JwtTokenUtil jwtTokenUtil;

    @Autowired
    private UserDetailsService userDetailsService;
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        String authHeader = request.getHeader(tokenHeader);
        //存在token
        if (null != authHeader && authHeader.startsWith(tokenHead)
        ) {
            String authtoken = authHeader.substring(tokenHead.length());
            String usernameFromToken = jwtTokenUtil.getUsernameFromToken(authtoken);
            //token存在但是未登录
            if(null!=usernameFromToken&&null== SecurityContextHolder.getContext().getAuthentication()){
                //登录
                UserDetails userDetails = userDetailsService.loadUserByUsername(usernameFromToken);
                //验证token是否有效，重新设置用户对象
                if(jwtTokenUtil.validateToken(authtoken,userDetails)){
                    UsernamePasswordAuthenticationToken authenticationToken=new UsernamePasswordAuthenticationToken(userDetails,null,userDetails.getAuthorities());
                    authenticationToken.setDetails((new WebAuthenticationDetailsSource().buildDetails(request)));
                    SecurityContextHolder.getContext().setAuthentication(authenticationToken);
                }
            }

        }
        filterChain.doFilter(request,response);
    }
}
